Figure 2. TEM analysis of HLA-DR+ dendritic cells and HLA-DR+ macrophages in radicular granulomas. (A) An HLA-DR+ macrophage. Large distinct phagosomes (*) can be seen. Bar = 3 µm. (B) Ultrastructure of an HLA-DR+ dendritic cell with a long cytoplasmic process in a lymphocyte (Ly)-rich area. Bar = 1.8 µm. (C) Frequency of HLA-DR+ dendritic cells and macrophages in the total area of the specimen (mean ± SD; n = 14). **p < 0.01. (D) Frequency of HLA-DR+ dendritic cells and macrophages in lymphocyte-rich areas (mean ± SD; n = 14). **p < 0.01.